Take into account that the mean of a data set is given by the sum of the elements of the data, divided by the number of elements.
Then, based on the previous description, you have:
mean = (17,481 + 14,983 + 13,521 + 14,550 + 18,570 + 14,993)/6
mean = 94,098/6
mean = 15,683
Hence, the mean of the given amounts is $15,683